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8+5u=3u-6
We move all terms to the left:
8+5u-(3u-6)=0
We get rid of parentheses
5u-3u+6+8=0
We add all the numbers together, and all the variables
2u+14=0
We move all terms containing u to the left, all other terms to the right
2u=-14
u=-14/2
u=-7
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